*sigh* Please don't kill me, some of us are not as technical as others. Can someone help me with some of the numbers I should plug in to my UG? Been searching the site for an hour or so and keep getting different things. I will highlight what I need in red. BTW, the UG says it cant sensor the fuel tank level, just the partial or full settings can be used..true? Also, if my speedo is off by around 13% due to the large tire size (according to tire size calculator), my miles for the distance function should be 1.13 miles traveled...correct? Thanks a lot for anyone who replies in advance. Please feel free to add anything else I should plug into UG. My truck has 35" tires btw.

So guys I got the distance calibration within a 0.5mph of my gps and phone GPS. All should be accurate now for mpg correct. In fact, I could prolly fine tune it some more because its about 0.5mph slower than the GPS. Thoughts?

So guys I got the distance calibration within a 0.5mph of my gps and phone GPS. All should be accurate now for mpg correct. In fact, I could prolly fine tune it some more because its about 0.5mph slower than the GPS. Thoughts?

tune with gps speed at 80 mph over 5 miles on a straight highway for best results
and accuracy from gps

Next tank, tell it that you filled the tank.
Go into Calibration > Calibrate Fuel
There will be a number there.
Change that number to match how much fuel you put in. Write this number down.
Next time you fill up, add the previous number to your new tank. So into Calibrate, and you'll see that the existing number is close, but not exact.

Each time you fuel up, repeat. After 5-10 tanks, you should be pretty close. My UG is rarely closer than 0.2mpg to calculated.

Now the good news... every time your fuel formulation changes... winter/summer, or the local nannies decide to change the ethanol content... you get to either live with the inaccuracy, or repeat the calibration procedure again.

Depending on fuel, my calibration is "correct" at a factor of anywhere from 1.080 to 1.099.

Spent a lot of time today fooling with the thing today; still unsure how to use the fuel tank settings properly

Edit sorry rich we posted about the same time

Tank settings are basic.
The unit can't tell when you refuel... you have to tell it that you gassed up.

I don't use "partial"... if it's the day before payday and I only have $20, I just save the receipt and add the two purchases for Fuelly.
For the UG, once I've got the fuel calibration set, all I do is use the "up" arrow to tell it that the tank is full, and then go into the Gauge menu and clear all trip.

Okay another distance calibration question for ya. So according to the tire size calculator, my speed is off by 13% ( I have 35/12.50/17s, on my speedo when I'm at dead 60mph, my gps and phone say I am going 67 mph).

So the UG is programmed at 5280 ft per mile/1.00. To get my proper distance calibration it would be 5280ft x 1.13 = 5966.4. I changed the calibration to this and it did change from 1.00 to 1.13 but the speed on the UG is still off (slower) that what my Garmin and Phone are telling me. Not by much, maybe 0.5-1.25 mph. Thoughts?

I want to get the most accurate real time MPG I can and today on the ride home, it was consistently in the 19-20 mpg range, with an avg at 19 (all freeway today, 75 miles or so). Seems high for me with lift/tires...thoughts? Do I need to adjust the 1.13 higher to match the Garmin/phone, to maybe 1.15 etc?...make sense?

I mainly bought the gauge for the real time/avg mpg feature btw and sorry if that is clear as mud. I drove my partner nutz today in the car.

You aren't going to be able to get both speed and odometer to be dead accurate, and that number will drift slightly as your tires wear, and even from brand to brand of the same size tire.

If your odometer is matching the GPS, and speed is within 2mph, I'd be happy as a clam with that.

And yes, the MPG calculations on mine were about 2mpg high with the factory fuel calibration.
You won't be close until at least 3-4 tanks.
Like the distance adjustment, the bigger the number the better.

You aren't going to be able to get both speed and odometer to be dead accurate, and that number will drift slightly as your tires wear, and even from brand to brand of the same size tire.

If your odometer is matching the GPS, and speed is within 2mph, I'd be happy as a clam with that.

And yes, the MPG calculations on mine were about 2mpg high with the factory fuel calibration.
You won't be close until at least 3-4 tanks.
Like the distance adjustment, the bigger the number the better.

Gothca, the thing is my odometer on my truck does not match my GPS, it is reads fewer miles than I really traveled. The MPH that is showing on the UG is close to the Garmin and phone but is off but just a tad. Am I missing something..

Just get the UG calibrated so that it's odometer is as close as possible and live with the UG's speed being off. The speed being off won't impact the MPG computations... that's all mileage and fuel burned.

On your calibration screen you have two options... one for fuel burn, and the other for speed/odometer. Reset the distance calibration, reset the GPS trip mileage, and hit the road for 200 miles.

Remember... a 2% error will barely show on a 50 mile run, but that same 2% error will be 4 miles over 200.